Captain Chuck Hasty said the juvenile was seriously injured by a 16-year-old when the small-caliber handgun discharged and hit him in the chest around 9 p.m..
Hasty said the sheriff's office is investigating to determine how the 16-year-old came in possession of the weapon.
Hasty declined to immediately release the name of the 16-year-old as the case remains under investigation.
The sheriff's office has free gunlocks available, he said, to prevent unintentional discharge of a weapon.
